0=-x^2+1587767878

Solution for 0=-x^2+1587767878 equation:

0=-x^2+1587767878

We move all terms to the left:

0-(-x^2+1587767878)=0

We add all the numbers together, and all the variables

-(-x^2+1587767878)=0

We get rid of parentheses

x^2-1587767878=0

a = 1; b = 0; c = -1587767878;
Δ = b2-4ac
Δ = 02-4·1·(-1587767878)
Δ = 6351071512
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{6351071512}=\sqrt{498436*12742}=\sqrt{498436}*\sqrt{12742}=706\sqrt{12742}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-706\sqrt{12742}}{2*1}=\frac{0-706\sqrt{12742}}{2}
=-\frac{706\sqrt{12742}}{2}
=-353\sqrt{12742}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+706\sqrt{12742}}{2*1}=\frac{0+706\sqrt{12742}}{2}
=\frac{706\sqrt{12742}}{2}
=353\sqrt{12742}
$